The problem is that, when I use the content assistant for the first time, operating correctly, but, when I use it again to add another attribute to the tag, this exception appears...

!ENTRY org.eclipse.e4.ui.workbench 4 0 2012-10-19 10:36:24.729
!MESSAGE
!STACK 0
org.eclipse.e4.core.di.InjectionException: java.lang.NullPointerException
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:63)
at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:229)
at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:210)
at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:131)
at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:171)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.executeCommand(KeyBindingDispatcher.java:276)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.press(KeyBindingDispatcher.java:494)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.processKeyEvent(KeyBindingDispatcher.java:545)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.filterKeySequenceBindings(KeyBindingDispatcher.java:366)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.access$0(KeyBindingDispatcher.java:313)
at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher$KeyDownFilter.handleEvent(KeyBindingDispatcher.java:82)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1262)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1052)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1104)
at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1100)
at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1521)
at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:4640)
at org.eclipse.swt.widgets.Canvas.WM_CHAR(Canvas.java:345)
at org.eclipse.swt.widgets.Control.windowProc(Control.java:4528)
at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:341)
at org.eclipse.swt.widgets.Display.windowProc(Display.java:4976)
at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2546)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3756)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1022)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:916)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:585)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:540)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:353)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:629)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
at org.eclipse.equinox.launcher.Main.main(Main.java:1414)
Caused by: java.lang.NullPointerException
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser1$DFA311.specialStateTransition(InternalIdeal2DslParser.java:11390)
at org.antlr.runtime.DFA.predict(DFA.java:80)
at org.eclipse.xtext.ui.editor.contentassist.antlr.internal.DFA.predict(DFA.java:25)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser23.rule__SectionAttributes__UnorderedGroup__Impl(InternalIdeal2DslParser.java:55850)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser23.rule__SectionAttributes__UnorderedGroup__0(InternalIdeal2DslParser.java:56392)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser23.rule__SectionAttributes__UnorderedGroup(InternalIdeal2DslParser.java:55811)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser2.ruleSectionAttributes(InternalIdeal2DslParser.java:8428)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser27.rule__SectionType__AttributesAssignment_1(InternalIdeal2DslParser.java:50673)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser7.rule__SectionType__Group__1__Impl(InternalIdeal2DslParser.java:58989)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser7.rule__SectionType__Group__1(InternalIdeal2DslParser.java:58944)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser7.rule__SectionType__Group__0(InternalIdeal2DslParser.java:58874)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser2.ruleSectionType(InternalIdeal2DslParser.java:8813)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser26.rule__BodyType__SectionAssignment_6(InternalIdeal2DslParser.java:47422)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser6.rule__BodyType__Group__6__Impl(InternalIdeal2DslParser.java:47592)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser6.rule__BodyType__Group__6(InternalIdeal2DslParser.java:47547)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser6.rule__BodyType__Group__5(InternalIdeal2DslParser.java:47456)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser6.rule__BodyType__Group__4(InternalIdeal2DslParser.java:47353)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser6.rule__BodyType__Group__3(InternalIdeal2DslParser.java:47278)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser6.rule__BodyType__Group__2(InternalIdeal2DslParser.java:47193)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser6.rule__BodyType__Group__1(InternalIdeal2DslParser.java:47118)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser6.rule__BodyType__Group__0(InternalIdeal2DslParser.java:47043)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser2.ruleBodyType(InternalIdeal2DslParser.java:7427)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser26.rule__UiType__BodyAssignment_2(InternalIdeal2DslParser.java:47217)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser6.rule__UiType__Group__2__Impl(InternalIdeal2DslParser.java:46925)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser6.rule__UiType__Group__2(InternalIdeal2DslParser.java:46872)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser6.rule__UiType__Group__1(InternalIdeal2DslParser.java:46802)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser6.rule__UiType__Group__0(InternalIdeal2DslParser.java:46727)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser2.ruleUiType(InternalIdeal2DslParser.java:7350)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser26.rule__IdealType__UiAssignment_8(InternalIdeal2DslParser.java:43978)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser4.rule__IdealType__Group__8__Impl(InternalIdeal2DslParser.java:30852)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser4.rule__IdealType__Group__8(InternalIdeal2DslParser.java:30807)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser4.rule__IdealType__Group__7(InternalIdeal2DslParser.java:30716)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser4.rule__IdealType__Group__6(InternalIdeal2DslParser.java:30620)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser4.rule__IdealType__Group__5(InternalIdeal2DslParser.java:30524)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser4.rule__IdealType__Group__4(InternalIdeal2DslParser.java:30428)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser4.rule__IdealType__Group__3(InternalIdeal2DslParser.java:30332)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser4.rule__IdealType__Group__2(InternalIdeal2DslParser.java:30257)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser4.rule__IdealType__Group__1(InternalIdeal2DslParser.java:30172)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser4.rule__IdealType__Group__0(InternalIdeal2DslParser.java:30097)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser2.ruleIdealType(InternalIdeal2DslParser.java:5887)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser26.rule__Xml__IdealAssignment_5(InternalIdeal2DslParser.java:43474)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser4.rule__Xml__Group__5__Impl(InternalIdeal2DslParser.java:29057)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser4.rule__Xml__Group__5(InternalIdeal2DslParser.java:29017)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser4.rule__Xml__Group__4(InternalIdeal2DslParser.java:28937)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser3.rule__Xml__Group__3(InternalIdeal2DslParser.java:28829)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser3.rule__Xml__Group__2(InternalIdeal2DslParser.java:28754)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser3.rule__Xml__Group__1(InternalIdeal2DslParser.java:28669)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser3.rule__Xml__Group__0(InternalIdeal2DslParser.java:28594)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser2.ruleXml(InternalIdeal2DslParser.java:5655)
at mymw.ideal2dsl.ui.contentassist.antlr.internal.InternalIdeal2DslParser2.entryRuleXml(InternalIdeal2DslParser.java:5612)
at mymw.ideal2dsl.ui.contentassist.antlr.Ideal2DslParser.getFollowElements(Ideal2DslParser.java:1860)
at org.eclipse.xtext.ui.editor.contentassist.antlr.AbstractContentAssistParser.getFollowElements(AbstractContentAssistParser.java:324)
at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.handleLastCompleteNodeAsPartOfDatatypeNode(ParserBasedContentAssistContextFactory.java:230)
at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.doCreateContexts(ParserBasedContentAssistContextFactory.java:155)
at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory$StatefulFactory.create(ParserBasedContentAssistContextFactory.java:148)
at org.eclipse.xtext.ui.editor.contentassist.antlr.ParserBasedContentAssistContextFactory.create(ParserBasedContentAssistContextFactory.java:577)
at org.eclipse.xtext.ui.editor.contentassist.CompletionProposalComputer.exec(CompletionProposalComputer.java:48)
at org.eclipse.xtext.ui.editor.contentassist.CompletionProposalComputer.exec(CompletionProposalComputer.java:1)
at org.eclipse.xtext.util.concurrent.AbstractReadWriteAcces.readOnly(AbstractReadWriteAcces.java:32)
at org.eclipse.xtext.ui.editor.model.XtextDocument.readOnly(XtextDocument.java:78)
at org.eclipse.xtext.ui.editor.contentassist.XtextContentAssistProcessor.computeCompletionProposals(XtextContentAssistProcessor.java:68)
at org.eclipse.jface.text.contentassist.ContentAssistant.computeCompletionProposals(ContentAssistant.java:1839)
at org.eclipse.jface.text.contentassist.CompletionProposalPopup.computeProposals(CompletionProposalPopup.java:566)
at org.eclipse.jface.text.contentassist.CompletionProposalPopup.access$16(CompletionProposalPopup.java:563)
at org.eclipse.jface.text.contentassist.CompletionProposalPopup$2.run(CompletionProposalPopup.java:498)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.jface.text.contentassist.CompletionProposalPopup.showProposals(CompletionProposalPopup.java:492)
at org.eclipse.jface.text.contentassist.ContentAssistant.showPossibleCompletions(ContentAssistant.java:1665)
at org.eclipse.jface.text.source.SourceViewer.doOperation(SourceViewer.java:932)
at org.eclipse.jface.text.source.projection.ProjectionViewer.doOperation(ProjectionViewer.java:1507)
at org.eclipse.ui.texteditor.ContentAssistAction$1.run(ContentAssistAction.java:82)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
at org.eclipse.ui.texteditor.ContentAssistAction.run(ContentAssistAction.java:80)
at org.eclipse.xtext.ui.editor.handler.ContentAssistHandler.execute(ContentAssistHandler.java:32)
at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:293)
at org.eclipse.ui.internal.handlers.E4HandlerProxy.execute(E4HandlerProxy.java:76)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:56)
... 48 more

I have disordered groups in other places of my grammar and didn't cause this problem... anyone know whats is happening?

The problem is that the content assistant fails in the "section" tag. It only works for the first attribute of the tag "section", if I try to add another attribute to the label with the assistant (Ctrl + Space) does not work and shows me the exception I mentioned in the first post.

If I don't use a disorderly group working properly. But I need a disorderly group there ...

I've been doing test and this error only happens when I make the changes to the parser file, that you indicated me here:

If I reduce the grammar until error "65535 bytes limit" disapear (I comment few lines from the DivMix rule) and left the parser unmodified works correctly. So I suspect the failure may be caused to changes in the parser file...

I hope now you understand the problem, I'm not very good at expressing in English.